A flexible display device is configured to be bendable along at least one bending axis, have two opposite sides at both ends of the bending axis, respectively, and include a first substrate and a second substrate opposite to each other, and a hetero-shaped double-sided adhesive tape bonding the first substrate and the second substrate to each other on at least one of the two opposite sides. The hetero-shaped double-sided adhesive tape includes a lower adhesive layer, a base material layer, and an upper adhesive layer which are stacked together in sequence. In a stacking direction of the lower adhesive layer, the base material layer and the upper adhesive layer, the upper adhesive layer has a non-overlapping region that does not overlap the lower adhesive layer, and/or the lower adhesive layer has a non-overlapping region that does not overlap the upper adhesive layer.
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1. A flexible display device, configured to be bendable along at least one bending axis, the flexible display device having two opposite sides at both ends of the bending axis, respectively, and the flexible display device comprising: a first substrate and a second substrate opposite to each other; and a hetero-shaped double-sided adhesive tape bonding the first substrate and the second substrate to each other on at least one of the two opposite sides, wherein the hetero-shaped double-sided adhesive tape comprises a lower adhesive layer, a base material layer, and an upper adhesive layer which are stacked together in sequence, the first substrate and the base material layer are bonded to each other by the lower adhesive layer, and the second substrate and the base material layer are bonded to each other by the upper adhesive layer; and wherein, in a stacking direction of the lower adhesive layer, the base material layer and the upper adhesive layer of the hetero-shaped double-sided adhesive tape, the upper adhesive layer has a non-overlapping region that does not overlap the lower adhesive layer, and/or the lower adhesive layer has a non-overlapping region that does not overlap the upper adhesive layer.
A flexible display device is designed to be bendable along at least one axis, with two opposite sides at the ends of this axis. The device includes a first substrate and a second substrate positioned opposite each other. A hetero-shaped double-sided adhesive tape bonds these substrates together on at least one of the opposite sides. The adhesive tape consists of a lower adhesive layer, a base material layer, and an upper adhesive layer stacked sequentially. The first substrate is bonded to the base material layer by the lower adhesive layer, while the second substrate is bonded to the base material layer by the upper adhesive layer. In the stacking direction of these layers, the upper adhesive layer has a non-overlapping region that does not align with the lower adhesive layer, and/or the lower adhesive layer has a non-overlapping region that does not align with the upper adhesive layer. This design allows for controlled flexibility and bonding strength, ensuring the display remains functional during bending. The non-overlapping regions help distribute stress and prevent delamination, improving durability in flexible display applications.
2. The flexible display device of claim 1 , wherein in an extending direction of the bending axis, each of a size of the upper adhesive layer and a size of the lower adhesive layer is smaller than a size of the base material layer, and a size of an overlapping region of the upper adhesive layer and the lower adhesive layer is smaller than a smaller one of the size of the upper adhesive layer and the size of the lower adhesive layer.
Flexible display devices are designed to bend or fold while maintaining display functionality. A key challenge is ensuring reliable adhesion between layers during repeated bending, especially around the bending axis, to prevent delamination or damage. This invention addresses this issue by optimizing the adhesive layers in a flexible display structure. The device includes a base material layer, an upper adhesive layer, and a lower adhesive layer. The base material layer provides structural support, while the upper and lower adhesive layers bond components above and below the base material. In the direction of the bending axis, both the upper and lower adhesive layers are smaller in size than the base material layer. Additionally, the overlapping region where the upper and lower adhesive layers intersect is smaller than the smaller of the two adhesive layers. This configuration reduces stress concentration at the bending axis, improving durability during repeated bending or folding. The overlapping region is minimized to prevent excessive stiffness, ensuring flexibility while maintaining adhesion. The design allows for controlled deformation, reducing the risk of delamination or failure in dynamic bending applications.
3. The flexible display device of claim 2 , wherein in the extending direction of the bending axis, the size of the overlapping region of the upper adhesive layer and the lower adhesive layer is smaller than ⅓ of the size of the base material layer.
A flexible display device includes a base material layer, an upper adhesive layer, and a lower adhesive layer. The device is designed to bend along a bending axis, allowing the display to flex or fold. The upper and lower adhesive layers are positioned on opposite sides of the base material layer to secure components or layers within the display structure. In the direction of the bending axis, the overlapping region where the upper and lower adhesive layers intersect is limited to less than one-third the size of the base material layer. This design ensures that the overlapping adhesive region does not excessively restrict bending flexibility, preventing stress concentration and potential damage during repeated flexing. The controlled overlap maintains structural integrity while allowing smooth deformation, which is critical for durable flexible displays in applications like foldable smartphones or wearable devices. The adhesive layers may also include additional features, such as alignment marks or conductive elements, to enhance functionality and assembly precision. The overall structure balances flexibility and durability, addressing challenges in maintaining performance under repeated bending cycles.
4. The flexible display device of claim 1 , wherein the upper adhesive layer and the lower adhesive layer do not overlap each other in an extending direction of the bending axis.
A flexible display device includes a flexible display panel, an upper adhesive layer, and a lower adhesive layer. The display panel is configured to bend along a bending axis. The upper adhesive layer is attached to an upper surface of the display panel, and the lower adhesive layer is attached to a lower surface of the display panel. The upper and lower adhesive layers are positioned such that they do not overlap each other in the direction along which the bending axis extends. This non-overlapping arrangement helps prevent interference between the adhesive layers during bending, reducing stress concentration and improving the durability of the display panel. The device may also include a protective layer covering the upper and lower adhesive layers to enhance structural integrity. The flexible display panel may be an organic light-emitting diode (OLED) display or another type of flexible display technology. The adhesive layers may be made of pressure-sensitive adhesive (PSA) or other flexible adhesive materials. The bending axis may be a central axis or an offset axis, depending on the design requirements. The non-overlapping configuration ensures smooth bending without delamination or damage to the adhesive layers.
5. The flexible display device of claim 1 , wherein the first substrate and the second substrate are connected to each other by the hetero-shaped double-sided adhesive tape at each of two sides at two opposite ends of the bending axis.
A flexible display device includes a first substrate and a second substrate that are connected by a hetero-shaped double-sided adhesive tape. The tape has a non-uniform cross-sectional shape, allowing for controlled bending and flexibility. The substrates are bonded at two opposite ends of a bending axis, ensuring structural integrity while enabling the display to flex. The hetero-shaped tape may include varying thicknesses or shapes along its length to accommodate different bending requirements. This design prevents delamination and maintains display performance during repeated flexing. The substrates may be rigid or flexible, and the tape may include adhesive layers optimized for adhesion to different materials. The device is useful in foldable or rollable displays where reliable bending is critical. The hetero-shaped tape ensures consistent adhesion and prevents stress concentration, improving durability. The substrates may be display panels, protective layers, or other components, and the tape may include additional features like conductive pathways or reinforcement elements. The design addresses challenges in flexible display manufacturing, such as maintaining adhesion during dynamic bending and ensuring long-term reliability.
6. The flexible display device of claim 1 , wherein in any one hetero-shaped double-sided adhesive tape, the upper adhesive layer is closer to a center of the flexible display device than the lower adhesive layer; and/or in any one hetero-shaped double-sided adhesive tape, the upper adhesive layer is farther away from the center of the flexible display device than the lower adhesive layer.
This invention relates to flexible display devices and addresses challenges in securely attaching flexible display panels to rigid or semi-rigid backplates using double-sided adhesive tapes. The problem involves ensuring proper alignment, adhesion, and durability of the display panel, especially when the device is bent or subjected to mechanical stress. The solution involves using hetero-shaped double-sided adhesive tapes with asymmetrical adhesive layers. In one configuration, the upper adhesive layer of the tape is positioned closer to the center of the flexible display device than the lower adhesive layer. In another configuration, the upper adhesive layer is positioned farther from the center than the lower adhesive layer. This asymmetry helps optimize adhesion strength, reduce stress concentration, and improve the overall structural integrity of the device. The adhesive tapes are designed to accommodate the bending and flexing of the display while maintaining a secure bond between the flexible display panel and the backplate. The invention enhances the reliability and longevity of flexible display devices in various applications, including foldable smartphones, tablets, and wearable electronics.
7. The flexible display device of claim 1 , wherein a display region of the flexible display device is rectangular, and the flexible display device has only one bending axis.
A flexible display device with a rectangular display region is designed to address the challenge of providing a compact, portable display that can be easily adjusted for different viewing angles or form factors. The device incorporates a single bending axis, allowing it to fold or bend along a predefined line while maintaining structural integrity. This bending axis enables the display to transition between flat and folded states, optimizing space usage and adaptability. The rectangular shape of the display region ensures compatibility with standard content formats while allowing for seamless transitions when bent. The single-axis design simplifies the mechanical structure, reducing complexity and potential failure points compared to multi-axis bending systems. This configuration is particularly useful in applications such as foldable smartphones, tablets, or wearable displays, where compactness and durability are critical. The device may include additional features, such as protective layers or stress-relief mechanisms, to enhance longevity and performance during repeated bending cycles. The overall design balances flexibility with structural stability, ensuring reliable operation in dynamic environments.
8. The flexible display device of claim 1 , wherein on at least one of two sides at two opposite ends of the bending axis, at least a part of an edge portion of the first substrate and at least a part of an edge portion of the second substrate are bonded to each other by a uniform-shaped double-sided adhesive tape; wherein the uniform-shaped double-sided adhesive tape comprises a second lower adhesive layer, a second base material layer and a second upper adhesive layer which are stacked together in sequence, the first substrate and the second base material layer are bonded to each other by the second lower adhesive layer, and the second substrate and the second base material layer are bonded to each other by the second upper adhesive layer; and wherein in an extending direction of the bending axis, a size of the second upper adhesive layer, a size of the second base material layer, and a size of the second lower adhesive layer are equal to each other.
Flexible display devices are designed to bend or fold while maintaining structural integrity and display functionality. A common challenge is ensuring reliable bonding between substrates on opposite sides of the bending axis to prevent delamination or damage during repeated flexing. This invention addresses this issue by using a uniform-shaped double-sided adhesive tape to bond edge portions of two substrates on at least one side of the bending axis. The adhesive tape consists of a second lower adhesive layer, a second base material layer, and a second upper adhesive layer stacked sequentially. The first substrate is bonded to the base material layer via the lower adhesive layer, while the second substrate is bonded to the base material layer via the upper adhesive layer. In the direction of the bending axis, the upper adhesive layer, base material layer, and lower adhesive layer have equal sizes, ensuring uniform bonding strength and preventing misalignment or stress concentration during bending. This design enhances durability and reliability in flexible displays by maintaining consistent adhesion across the bonded area.
9. The flexible display device of claim 1 , further comprising a display component between the first substrate and the second substrate.
A flexible display device includes a first substrate and a second substrate, where the second substrate is positioned over the first substrate. The device further includes a display component positioned between the first and second substrates. The display component is configured to generate visual output, such as images or text, and may include elements like organic light-emitting diodes (OLEDs), liquid crystal displays (LCDs), or other flexible display technologies. The first and second substrates provide structural support and protection for the display component while allowing the device to bend or flex without damaging the display. The substrates may be made from flexible materials such as polyimide, polyethylene terephthalate (PET), or other polymers. The display component is integrated between the substrates to ensure durability and flexibility, enabling the device to conform to curved surfaces or be rolled up without compromising functionality. This design addresses the challenge of creating a flexible display that maintains performance and reliability under mechanical stress, making it suitable for applications in wearable electronics, foldable devices, and other flexible display technologies.
10. The flexible display device of claim 9 , wherein the display component is on the first substrate.
A flexible display device includes a display component and a flexible substrate. The display component is positioned on a first substrate, which is part of a multi-layer structure. The device also includes a second substrate, which is bonded to the first substrate. The second substrate has a first region with a first thickness and a second region with a second thickness, where the second thickness is greater than the first thickness. The second substrate is bonded to the first substrate in the first region, while the second region is not bonded to the first substrate. This configuration allows the second substrate to flexibly support the display component, reducing stress and improving durability. The device may also include a protective layer covering the display component and a flexible circuit layer for electrical connections. The second substrate's varying thickness ensures flexibility in specific areas while maintaining structural integrity in others, addressing issues related to stress concentration and mechanical failure in flexible displays. The design enables the display to bend or fold without damaging the display component, making it suitable for applications requiring high flexibility and durability.
11. The flexible display device of claim 9 , wherein the display component is connected to the second substrate by an optical adhesive.
A flexible display device includes a display component and a substrate structure. The substrate structure comprises a first substrate and a second substrate, where the first substrate is positioned on a first side of the display component and the second substrate is positioned on a second side of the display component opposite the first side. The second substrate is configured to support the display component and may include a flexible material. The display component is connected to the second substrate using an optical adhesive, which ensures optical clarity while providing structural bonding. This configuration allows the display to maintain flexibility while preventing delamination or optical distortion. The optical adhesive may be applied in a patterned or uniform manner to optimize adhesion and light transmission. The device may further include additional layers, such as a protective layer or a touch-sensitive layer, integrated with the substrate structure. The flexible display is designed for applications requiring durability, thinness, and high optical performance, such as foldable smartphones, wearable devices, or flexible tablets. The optical adhesive ensures reliable bonding without compromising display quality or flexibility.
12. The flexible display device of claim 9 , wherein the display component comprises: any one of a display panel, a display touch panel, and an assembly of the display panel and a touch panel.
A flexible display device includes a flexible display component that can be deformed into a curved or bent shape. The display component may be a standalone display panel, a touch-sensitive display panel, or an assembly combining a display panel with a separate touch panel. The device is designed to provide a flexible and adaptable display surface that can conform to various shapes while maintaining functionality. The display panel may be an organic light-emitting diode (OLED) or another flexible display technology, allowing for thin, lightweight, and bendable configurations. The touch panel, if included, enables user interaction through touch inputs, even when the display is bent or curved. The device may also include a support structure to maintain the desired shape and protect the display component from damage during deformation. This technology addresses the need for flexible, durable, and interactive display solutions in applications such as wearable devices, foldable smartphones, and curved monitors.
13. The flexible display device of claim 1 , wherein the second substrate is a cover plate and the first substrate is a middle frame.
A flexible display device includes a first substrate and a second substrate, where the second substrate is a cover plate and the first substrate is a middle frame. The device is designed to address challenges in flexible display manufacturing, particularly in ensuring structural integrity and durability while maintaining flexibility. The cover plate serves as a protective outer layer, while the middle frame provides structural support and facilitates the integration of internal components. The flexible display device is engineered to withstand bending and folding without damage, making it suitable for applications in foldable smartphones, tablets, and other portable electronic devices. The middle frame may include features such as reinforcement structures or flexible connectors to enhance durability and performance. The cover plate is typically made from a transparent, impact-resistant material to protect the display while allowing visibility. The interaction between the cover plate and the middle frame ensures that the display remains functional under repeated flexing, addressing issues related to stress concentration and material fatigue. This design improves the reliability of flexible displays in real-world use, where devices are subjected to frequent bending and folding. The device may also incorporate additional layers, such as adhesive layers or protective coatings, to further enhance its performance and longevity.
14. A hetero-shaped double-sided adhesive tape, comprising a lower adhesive layer, a base material layer, and an upper adhesive layer which are stacked together in sequence, wherein in a stacking direction of the lower adhesive layer, the base material layer and the upper adhesive layer of the hetero-shaped double-sided adhesive tape, the upper adhesive layer has a non-overlapping region that does not overlap the lower adhesive layer, and/or the lower adhesive layer has a non-overlapping region that does not overlap the upper adhesive layer.
Hetero-shaped double-sided adhesive tapes are used in applications requiring precise bonding with uneven or irregular surfaces. Traditional double-sided tapes have aligned adhesive layers, which can limit their use in complex assemblies where partial adhesion is needed. This invention addresses the problem by providing a tape with mismatched adhesive layers, allowing selective bonding in specific areas. The tape consists of three stacked layers: a lower adhesive layer, a base material layer, and an upper adhesive layer. The key innovation is that the adhesive layers are intentionally misaligned in the stacking direction, creating non-overlapping regions where one adhesive layer extends beyond the other. This design enables partial adhesion, where only one side of the tape adheres to a surface while the other side remains free. The non-overlapping regions can be on either the upper or lower adhesive layer, or both, depending on the application. The base material layer provides structural support while accommodating the misalignment of the adhesive layers. This configuration allows for flexible bonding solutions in electronics, automotive, and construction industries, where precise adhesion patterns are required.
15. The hetero-shaped double-sided adhesive tape of claim 14 , wherein in a direction perpendicular to the stacking direction, each of a size of the upper adhesive layer and a size of the lower adhesive layer is smaller than a size of the base material layer, and a size of an overlapping region of the upper adhesive layer and the lower adhesive layer is smaller than a smaller one of the size of the upper adhesive layer and the size of the lower adhesive layer.
This invention relates to a hetero-shaped double-sided adhesive tape designed to address challenges in bonding applications where precise alignment and controlled adhesion are required. The tape comprises a base material layer with an upper adhesive layer on one side and a lower adhesive layer on the opposite side. The key feature is that, in a direction perpendicular to the stacking direction, both the upper and lower adhesive layers are smaller in size than the base material layer. Additionally, the overlapping region where the upper and lower adhesive layers intersect is smaller than the smaller of the two adhesive layers. This configuration allows for selective adhesion, reducing unintended bonding while maintaining structural integrity. The design ensures that the adhesive layers do not fully cover the base material, preventing excessive adhesion or misalignment during application. This is particularly useful in applications requiring precise positioning, such as in electronics assembly or medical device manufacturing, where controlled adhesion and minimal overlap are critical. The tape's hetero-shaped design optimizes bonding performance while minimizing material waste and improving ease of use.
16. The hetero-shaped double-sided adhesive tape of wherein in the direction perpendicular to the stacking direction, the size of the overlapping region of the upper adhesive layer and the lower adhesive layer is smaller than ⅓ of the size of the base material layer.
This invention relates to a hetero-shaped double-sided adhesive tape designed to address challenges in bonding applications where precise alignment and controlled adhesion are required. The tape comprises a base material layer with an upper adhesive layer on one side and a lower adhesive layer on the opposite side. The key feature is that, when viewed perpendicular to the stacking direction, the overlapping region between the upper and lower adhesive layers is less than one-third the size of the base material layer. This design ensures that the adhesive layers do not fully align, preventing excessive bonding strength or unintended adhesion in certain areas. The tape is particularly useful in applications where selective adhesion or controlled detachment is necessary, such as in electronics assembly, automotive components, or medical devices. The non-uniform overlap of the adhesive layers allows for tailored bonding properties, such as differential adhesion strength or directional peel resistance, while maintaining structural integrity. The base material layer provides mechanical support, while the upper and lower adhesive layers are optimized for specific bonding requirements. This configuration enhances flexibility in manufacturing processes and improves performance in dynamic environments.
17. The hetero-shaped double-sided adhesive tape of claim 14 , wherein the upper adhesive layer and the lower adhesive layer do not overlap each other in a direction perpendicular to the stacking direction.
The invention relates to a hetero-shaped double-sided adhesive tape designed to address challenges in bonding applications where overlapping adhesive layers can cause issues such as uneven adhesion, air pockets, or material stress. The tape features an upper adhesive layer and a lower adhesive layer that are intentionally misaligned in a direction perpendicular to the stacking direction, meaning they do not overlap when viewed from above or below. This non-overlapping configuration prevents interference between the adhesive layers, ensuring consistent bonding performance and reducing the risk of defects. The tape may include a substrate with adhesive layers applied to both sides, where the upper and lower adhesive layers are offset or staggered relative to each other. This design is particularly useful in applications requiring precise adhesion, such as electronics assembly, automotive components, or medical devices, where overlapping adhesive layers could compromise structural integrity or functionality. The non-overlapping arrangement also allows for better material utilization and flexibility in bonding irregular surfaces. The invention improves upon conventional double-sided tapes by eliminating the drawbacks of overlapping adhesive layers while maintaining strong adhesion properties.
18. The hetero-shaped double-sided adhesive tape claim 14 , wherein the base material layer is made of a flexible material.
A hetero-shaped double-sided adhesive tape is designed for applications requiring precise bonding in irregular or contoured surfaces. The tape includes a base material layer with a non-uniform thickness, allowing it to conform to complex geometries while maintaining strong adhesion. The base material layer is made of a flexible material, such as a polymer or elastomer, which enhances adaptability to uneven surfaces. The tape also features an adhesive layer on both sides, with at least one side having a patterned or discontinuous adhesive layer to improve bonding performance in specific areas. The adhesive layers may be formulated to bond with different substrates, such as metals, plastics, or glass, depending on the application. The flexible base material ensures durability and resistance to deformation under stress, making it suitable for automotive, electronics, and construction applications where precise and reliable adhesion is critical. The tape's design addresses challenges in bonding irregular surfaces, such as gaps or curves, by providing a conformable and adaptable adhesive solution.
19. The hetero-shaped double-sided adhesive tape of claim 14 , wherein the base material layer is made of at least one of polyethylene terephthalate, polyethylene naphthalate, cycloolefin polymer, polyimide, and polycarbonate.
This invention relates to a hetero-shaped double-sided adhesive tape designed for applications requiring precise bonding and structural support. The tape addresses challenges in industries such as electronics, automotive, and construction, where conventional adhesive tapes fail to provide sufficient adhesion, durability, or compatibility with irregular surfaces. The tape features a base material layer composed of at least one of polyethylene terephthalate, polyethylene naphthalate, cycloolefin polymer, polyimide, or polycarbonate, offering high strength, chemical resistance, and thermal stability. The base material layer is coated with adhesive layers on both sides, allowing for secure bonding to various substrates. The tape's hetero-shaped design enables it to conform to uneven or complex surfaces, ensuring uniform adhesion and preventing delamination. The adhesive layers may include pressure-sensitive adhesives, heat-activated adhesives, or other specialized formulations tailored to specific applications. The tape's construction ensures long-term reliability in demanding environments, such as high-temperature or high-moisture conditions. This invention improves upon prior art by providing a versatile adhesive solution that combines structural integrity with adaptability to diverse bonding scenarios.
20. The hetero-shaped double-sided adhesive tape of claim 14 , wherein each of the upper and the lower adhesive layer is made of at least one of acrylic, silicon-based resin, polyurethane, and epoxy resin.
The invention relates to a hetero-shaped double-sided adhesive tape designed for improved bonding in applications requiring varied adhesion properties. The tape features a core layer with a non-uniform cross-sectional shape, allowing it to conform to irregular surfaces while maintaining structural integrity. The upper and lower adhesive layers are independently formulated from materials including acrylic, silicon-based resin, polyurethane, or epoxy resin, enabling customization of adhesion strength, flexibility, and environmental resistance. This design addresses challenges in bonding dissimilar materials or surfaces with complex geometries, where conventional tapes fail due to inadequate conformability or inconsistent adhesion. The adhesive layers can be tailored for specific applications, such as automotive assembly, electronics packaging, or medical devices, by selecting resins that optimize performance under different conditions. The tape's hetero-shaped core enhances load distribution and reduces stress concentrations, improving durability in dynamic environments. The invention provides a versatile solution for industries requiring reliable adhesion across diverse substrates and operating conditions.
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May 28, 2019
March 1, 2022
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